Attachment for the feed-bars of die-presses or the like.



APPLICATION HLED FEB. 23, 1917- L252,278.

Patented Jan. 1, 1918.

4 SHEETSFSHEET I.

Eu? 25v WITNESS h I mmv oga. Charles 12M flonadcd.

A TTORNEYS.

, C. D. McDONALD. ATTACHMENT FOR THE FEED BARS 03015 PRESSES ORTHE LIKE.

APPLICATION FILED FEB. 23. 19!].

Patented Jan. 1,1918.

IN V EN TOR. Charles 171% 170- A TTORNEYS.

C. D. MCDONALD. ATTACHMENI EOR THE FEED BARS OF DIE PRESSES OR THE LIKE.

APPLICATION FILED FEB-23,19l7.

Patented Jan. 1, 1918.

4 SHEETS-SHEET 3- k A C INVENTOR. (523 //.M 170W.

'ATORNEYS.

WITNESS C. D. McDONALD.

ATTACHMENT FOR THE FEED BARS 0F DIE PRESSES OR THE LIKE.

APPLICATION FILED FEB-23,1917.-

1 ,252,278, I Patented Jan. 1, 1918,

4SHEETS-SHEET 4. 1

l t- 2* E fl i OML/ I 7 g 'INVENTOR. WITNESS I CharZc sflflwomld.

BY Ml v l A TTORNEYS.

" oNrrED STATES PATENT mm CHARLESD. MCDONALD, OF CHICAGO, ILLINOIS.

ATTACHMENT FOR THE FEED-BARS OF DIE-PRESSES OR THE LIKE.

To all whom it may concern.

' Be it known that I. CHARLES D. lVIcDrm- ALD, a citizen of the United.States, residing at Chicago, in the county of Cook and-State ofIllinois, have invented certain new and useful Improvements inAttachments for the Feed-Bar of Die-Presses or the like, of which thefollowing is a specification.

The present invention relates-to an attachment adapted to be used inconnection with the automatic feed-bar or feed-mechanism between thedrive-shaft and the operative portions of the pressv whenever anobstruction is encountered by the feed-bar which prevents the normalmovement thereof, whereby 'a continuing operation of the d1e' andassociated parts of the press after the feed of the work is stopped, iseliminated,

and the danger of wear and tear, and oftentimes serious injury to thepress, is avoided. A further object of the invention is to employ 'amechanism for carrying out the above purpose which will be capable ofuse in connection witha feed-mechanism, using a releasable connectionbetween the feedbar and the partfor operating the same.

A further object of theinventioiiis to employ a shift'able means whichwill be actuated upon stoppage of the feed-bani, and to arrange aconnection between such shiftable means and certain clutch andbrake'mechanism so that upon operation of the-shiftable means,furthercommunication of power from the drive-shaft'to the operativeportions of the press is cut off.

Theinvention further consists in the fea tures of construction andcombination of,

ment for correction.

parts hereinafter described and claimed.

In the drawings: I Figure l is a side view of a die-press body, showingthe means for operating the feeding-mechanism, and showing the device ofthepresent invention in operative position; Fig. 2, a detail front view,showing the feed-bar and its connection, together with the attachment ofthe present invention, and

with the parts in the position they assume during the normal operationof the feedbar:

Specification of Letters Patent.

Patented J an. 1, 1918.

Application: filed February 23, 1917. Serial No. 150,447.

Fig. 3, a view similar to Fig. 2, showing the. parts in the positionthey assume when the feed-bar encounters an obstruction preventing itsnormal movement, and with the feed-bar released from its operatingmember and the attachment of the present invention -moved so as to setthe mechanism which breaks the connection. between the powershaft andthe operating portions of' the P s Fig. 4, a view of the mechanism whichmakes and breaks the connection between the power-shaft andthe operativeportions of the press, and showing such'connection in released position,which is the position .assumed when a connectlon 1s being mamtainedbetween the drive-shaft and opera- Fig. 8, a detail face view of theclutch mechanism;

Fig; 9,75 detail, partly in section, of the clutc mechanism; and

Fig. 10,11; detail showing one of the which-actuate theclutch mechanism.

arms

In connection with automatic die-presses, areciprocating feed-mechanismin the form of a bar is generally employed for moving the workstep bystep into operative posi-.

tion below the die plunger. Owing to irregularities in the work, or amisplacement of the work during the feeding operation, the

work becomes jammed in the feed way, and upon a continued'opera'tion ofthe feed-bar, necessarily a condition arises which is detrimental to themachineand requires a stoppage of-the machine and a partial dismantle-In Patent No.-'1,039,565, granted September 24, 1912, to C. D. McDonald,for metal working machines, there is shown a releasableattachmentbet'wem the feed-bar and the crank-arm, which operates saidbar,-

tion of the difficulty in connection with the the feed-bar fromcontinuingto pound the choked work, and thus increasing the chok ingofthe feed passage. However, this re leasement of the feed bar resultedonlyin stopping the operation of the feed-bar. The

remainder of the mechanisms of the press continued to operate. The dieplunger continued to pound into the female die, oftentimes creating amutilation of the die or placing a stra n on the crank-shaftwhichoperates the die, so that said shaft was bent,

Either of the above conditions, of course, is detrimental and requiresreplacement of parts, which is not only expensive, by reason of the costof. new parts, but, further, in that the press is put out of service fora great'ei or less length of time. I In the present invention, when achoking of the feed channel-is encountered, the feedbar isnot onlyreleased from engagement with the crank-arm and its movements stopped,but such releasing operates automatically certain mechanisms which cutoff thesupply of power from'the crank-shaft to theremainder of theoperating portions of the press, thus stopping the entire pressmechanism and eliminating the damage heretofore referred to, which mayresult from a continuing of the operation of the remainder of the pressmechanism afterthe feed-bar has ceased to operate.

In the drawings, illustrating one embodiment of my invention, I haveshown a press body 11, which may be of any suitable size and style; andmou'nted in said press body is a main driving-shaft 12. This shaft, as

. shown, is employed in connection with a reciprocating toggle arm 12for operating the- 'die plunger. This toggle arm and its method ofope'ration'is fullyshown in my co-pending application Serial'No.150,445,

filed-February 23, 1917, and entitled Ap'pli- V ances fordie-presses orthe like, and a detailed illustration and description are not I deemednecessary in the present application,

' you particularly in view of the fact that'the present invention isdeemed to be adaptable for application to presses whichv may employ adifferent method than .th'e'above for operating the die plunger.

As shown in the drawings,-and more particularly in Fig. 1, thecrank-shaft 12 operates a gear l3'meshing with a gear 14 on a stub-shaft15, which stub-shaft alsocarries a gear 16meshing with a gear 17 on astubfshaft 18, on which shaft is also mounted a disk 19. Eccentricallysecured to this disk is a rod 20, which, as shown, is pivotallyconnected to a head 21 mounted in a' slot 22 in a'rocking lever 23,pivoted at 24. The, head 21 is ad ustable back and forth in'the slot 22so as to vary the degree of movement-imparted by the rod 20 to the lever23. Connected to one free end of this lever a fork jammingabove setforth, since it prevented 25, to which is pivotally secured ahead 26connected to a rod 27. This rod terminates in a head 28, from whichextends a sleeve 29 Y bolted orotherwise secured to a flange 30 on.

a rocking arm 31 (see Figs. 1, 2 and 3). This rocking arm is pivoted toswing upon a pin 32, and its end 33 is entered between 1 spring jaws 34held ,normally closed by when the feed-bar encounters an impediment toits normal movement within the feed channel, as by a j amming of thework within said'channel, the end 33 of thecrank arm 31 will pull outfrom between the jaws 34, breaking the connection between the crank arm.and the feed-bar and stoppingfurther movement of said bar.

The foregoing connection between the feed-bar and crank-arm is disclosedin my issued Patent No. 1,039,565, of September 24, 1912, and'heretoforereferred to. No claim is made to this construction in the present case,other than may be in combination with the particular parts whichrelateto the presentinvention.

'As previously explained, while the discon-, necting of this feed-barfromthe crank-arm will stop the operation of the bar, it will have noeffect in stopping the operation of the remainder of the pressmechanisms, and the presentinventi'on deals with the creation of powerthrough the main drive-shaft to the balance of the press mechanisms whennormal movement of the feed-bar is prevented by jamming of the work,etc.

To carry outthis automatic stopping in the construction shown, I employa link 42 of amechanism for stopping the application pivotally connectedby a pin 43 to the arm 37. The link '42 has a slot 44 in its lower end,in which rests a pin 45 on an arm 46, which is pivotally mounted upon apin 47.

- The arm 46 has extending therefrom flanges 48, in the nature of afork, and between which passes the stem 49, having an abutment 50 onone-end, and formed upon its opposite end with a head 51 connected to anarm 52, which is keyed or otherwise secured to a cross-shaft 53.

To the opposite end of the cro'ss-shaft53 is secured a lever 54 providedwith a suitable hand grip (see Figs. 4 and 5). This lever -is limited,as-shown, in its up and down movements by means of adjustable stops 55.

Connected to the lever 54 is a link 56 joined to a rocking lever 57, oneend of which latter lever is connected to a rod 58, which operates abrake spreader 59;

-' best illustrated in Figs. 8, Sand 10, and each embodies a cam orwedge-shaped face 67, which .is adapted to enter beneath a clutch pin68and force said pin outwardly, breaking the clutch connection from thedriveshaft to the remainder of the machine.

The clutch pin enters into a recess ina collar 69 ona fiy-wheel-70, andit is through this collar and pin that the connection is made fromthefiy-wheel to. that portion of the drive-shaft that operatesthepress-mecha-nisms. This form of-clutc'h is one well adapted for usewith the toggle die-plunger operation described inmy co-pending application heretofore referred to; but it is understood that this form ofclutch is only shown for the purpose of illustrating one form adaptedfor use in connection with the present invention, since, of course, avariety of styles. of clutches might be employed, and particularly so ifthe die plunger should be operated by means other than the toggle arms.

The clutch illustrated is one which will act when the crank-shaft turnsa half revolution after i the clutch-actuating arms are set, owing tothe presence of a clutch arm on each side of the shaft. Thisform ofclutch is desirable with presses in iwh-ich-the die plunger is actuatedby toggle mechanism,

since,when so actuated, there are two'strokes -of thedie plunger to eachrevolutionxof the crank-shaft, andby arrangin the-clutch so that it willset when a 'hal completed, the clutch will act to stop the machine whenthe die plunger reaches the limit of its up-stroke. 1 It is to benotedthat by'reason-of the various links and levers employed, the 'movementfrom the link 42 to the brake spreader and clutch-actuating arms 1 isamplified, so

that these latter parts'are enabled to per-' form their functionswithout undue strain being placed on the initial movable parts. Theoperation briefly is as follows When an obstruction is encountered invthe feedchannel, the resistance exerted on the feed-bar will arrestthcmovement of the latter, causing the end of the crank-arm 31 to pullout from the jaws 34. The arm 37 will then-fall by gravity, pushingdownward the link 42 and the pin 45, through engagement with the end ofthe slot 44, will be forced downward, pushing down the arm 46 andpulling down the rod 49, as in Fig. 3. This downward movement of the rod49 will pull the free end of the arm 52 downward, rocking the shaft 53.,and causing the lever 54 revolution is r to swing from the position ofFig. 4 to that thewedge faces-of said clutch arms into the positionwhereby one or the other engages the pin 68, moving it out-of its recesswithin the hub 69 of the fly-wheel, andbreaking the connection to themain drive-shaft. This stops the entire press mechanisms and eliminatesany danger'of damage through the plungerand other press mechanismscontinuing to operate after the feed-bar has stopped. I

- To reset the machine, the crank-arm 31 is placed back in the positionshown in Fig. 2, so that it is connected once more to the arm 37 andadapted to actuate the feed-bar. The lever 54 is then thrown from theposition shown in Fig. '5 tothat shown in Fig. 4',

which rocks the lever 57 into the position means for actuating the feedmeans, means f for controlling the application of power to said powerdriven means, and means for actuating said power controlling means tostop the application of powerto said power driven means when said feedmeans encounter an abnormal resistance to their normal, movement,substantially as described.

2. In mechanism of .the class described, the combination1 of 5 feedmeans,. .power driven means 'for actuating the feed means, means forcontrolling the application of power to said powerdriven means,shiftable means for actuating said power controlling means and adaptedto shift whensaid feed means encounter an abnormal resistance totheirnormal-operation, said shiftable means when so shifted moving thepower controlling means to cut off the application of power to saidpower driven means, substantially as described.

3. In mechanism of the class" described,

the combination of feed means, power driven means for actuating the feedmeans, a releasable connection between the feedmeans scribed.

and the power driven means adapted to release when the feed meansencounter an abnormal resistance to the1r normal .move- .ment, means forcontrolling the application of power-to said power driven means, andmeans actuated by the breaking of said releasable connection for movingthe power controlling means and cutting off the application of power tosaid power driven means, substantially as described. w

4. In mechanism of the class described, the combination of feed means,power driven means for actuating the feed means, a releasable connectionbetween the feed means and power driven means adapted to release whenthe feed means encounter anabnormal resistance to their normal movement,means for controlling the application of power to the power drivenmeans, shiftable means for actuating the power controlling means andshifted by the breaking of said releasable connection, and when soshifted actuating said power controlling means to cut off the supply ofpower to said power driven means, substantially as de- '5. In mechanismof the class described,

. the; "combination of feed means, power [driven means for operating thefeed means for controlling the application of.-

driven means for operating the feed means, means for controlling theapplication of power to'said power driven means, shiftable means foroperating said ower controlling means and adapted to 'shi t when saidfeed means. encounter an abnormal resistance to their normal movement, across-shaft, a connection between said cross-shaft and said shiftablemeans, and aconnection between the cross-shaft and the means forcontrolling the application of power, whereby said shiftable'means .whenshifted operate the power controlling means to cut off the applicationof power from said power driven means, substantially as described.

6. In mechanism of the class described,-

the A combination of feed means, power means,

power to said power driven means, 1 means for actuating said powercontrolling means,

said actuatingmeans moving by gravity whenthe feed means encounter anabnormal release when thefeed means encounter an' abnormal reslstance totheir normal moveresistanceto their normal movement and "when 's'oimoved actuating said power-.con- V trolling means to cut off theapplication of 55 power, to' said power jdriven stantially as describedh7. In mechanism of the class described, the combination offeed means,power driven'means for actuating "the-feed means, a releasableconnection between the feed means and power driven means adapted tomeans, subsaid connection is broken,

the combination of feed fdriven means for actuating the feed means,

ment, a member moving by gravity when and means actuated by saidmovement of said gravity operated member for cutting off the applicationof power to said power driven means,

* substantially as described.

8. In mechanism of the class described,

means,

1 asdescribed.

I ,9. In mechanism of the classdescribed,

the combination -of feed means, power driven means for operating thefeed means,

means for controlling the application of power gravity actuated member,a

power to said power driven means, shiftable means for operating saidpower controlling means shifting when the feed means encounter anabnormal resistance to .their normal movement, a connection between theshiftable means and power controlling means actuating when the shiftablemeans are shifted to cut ofi' the application of power to said powerdriven means, and said connection being arranged to amplify the movementfrom said shiftable means to said power controlling. means intransmitting movement between these parts, substantiallp as described. rr 10. In mechanism ofthe class described,

the combination of feed means, power driven means for operating the feedmeans, means for controlling the application of power to said powerdriven means, shiftable means for operating said power controlling meansand shiftingwhen said feed means encounter an abnormal resistance totheir normal movement, a series of links and -levers connecting saidshiftable means and said power controlling means, said shiftablemeanswhen shifted actuating said link and lever connection tomove the powercontrollingmeans andcut ofl the application of power to said powerdrivenmeans, and said connection servingvfurther to amplify the movement ofthe'shiftable means in transmitting such movement to the powercontrolling .means, substantially as described. Y

, CHARLES I).v MoDONALD.

